After a journey that has lasted a decade, Europe's Rosetta spacecraft is now on its final approach to a comet.
The tiny probe is set to rendezvous on Wednesday with one of the strangest objects in the solar system.
The latest in a series of manoeuvres will bring Rosetta to within 100km of Comet 67P/Churyumov-Gerasimenko.
One of the scientists leading this European Space Agency (Esa) venture described it as "the sexiest, most fantastic mission ever".
Throughout human history, comets lighting up the night sky have triggered fascination and fear but their speed and distance have made them difficult to investigate.
One theory is that they delivered water, carbon and other essential building-blocks for life to the early Earth.
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